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Vulnerability record · CVE-2015-8968 · published 3 November 2016

CVE-2015-8968: Squareup git-fastclone command injection vulnerability

Squareup · Git Fastclone

git-fastclone before 1.0.1 permits arbitrary shell command execution from .gitmodules. If an attacker can instruct a user to run a recursive clone from a repository they control, they can get a client to run an arbitrary shell command. Alternately, if an attacker can MITM an unencrypted git clone, they could exploit this. The ext command will be run if the repository is recursively cloned or if submodules are updated. This attack works when cloning both local and remote repositories.

8.8 CVSS 3.1 High EPSS 5.2% · top 7.8% CWE-77 · Command injection
8.8CVSS 3.1 base score, v2 9.3
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

git-fastclone before 1.0.1 permits arbitrary shell command execution from .gitmodules. If an attacker can instruct a user to run a recursive clone from a repository they control, they can get a client to run an arbitrary shell command. Alternately, if an attacker can MITM an unencrypted git clone, they could exploit this. The ext command will be run if the repository is recursively cloned or if submodules are updated. This attack works when cloning both local and remote repositories.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/81433 Third Party AdvisoryVDB Entry
https://github.com/square/git-fastclone/pull/2 PatchVendor Advisory
https://hackerone.com/reports/104465 ExploitThird Party Advisory
http://www.securityfocus.com/bid/81433 Third Party AdvisoryVDB Entry
https://github.com/square/git-fastclone/pull/2 PatchVendor Advisory
https://hackerone.com/reports/104465 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2015-8968), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.